Calculating heat loss

The calculated transmissions loss is the sum of the heat losses from each individual section of the building.

The calculated transmissions loss is the sum of the heat losses from each individual section of the building.

These can be calculated using the following formula:
Φ =U x A x (tout- tin)
where
Φ = Heat loss for the building section [W]
U =Coefficient of heat transmission for the building section [W/m²K]
A = Area of the building section [m²]
tout = Outdoor temperature at design conditions [°C]
tin = Indoor temperature at design conditions[°C]

The calculated heat loss is used to size the heating system of the building according to design conditions for the temperatures outside and inside of the building. Approximately 10-20% is typically added to the calculated heat loss, in order to ensure extra capacity following night set-back or similar situations.





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